eastward
adv.toward the east. You use this to describe moving or looking in the direction of the sunrise.
adv.moving, facing, or situated toward the east.
“The ship sailed eastward into the rising sun.”
“After crossing the mountain range, the pioneers continued eastward across the vast plains toward the coast.”
“The storm system is expected to track eastward throughout the afternoon, bringing heavy rain to the coastal regions by nightfall.”
Often functions as a directional adverb; can also be used as an adjective before a noun.
Directional adverbs ending in -ward do not require the preposition 'to'.
From Middle English estward, from Old English ēastweard, ēasteweard; equivalent to east + -ward.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.